Rather annoyingly, I only have 8 of them and I need 10. Problem is I'm past the final battle so there are no waterways to look in under the city, I've already done reynard's quest so he's no longer around to sell them to me.

Just as your about to enter the craftsman's quater, theres a 5ft wall to your right, theres barely any room behind it as it's next to the main wall or a building, theres often a piece behind it.

In addition to this one, there are at least three that are reachable on various rooftops around the Urban Quarter, post-game (most easily reached by climbing the northern tower, past the armorer, in the Urban Quarter).